Quieter laptop

Yes, my laptop arrived safe and sound. Well, mostly safe. It was actually delivered to another address on campus, but it eventually arrived at Afilias.

Tonight, as I wait for the phone to ring, I decide to play with the fan and see if I could shut it off. I can:

# sysctl dev.acpi_ibm.0.fan=0
dev.acpi_ibm.0.fan: 1 -> 0

Checking the temp was easy and pretty soon things jumped from about 48C to just over 60C.

# sysctl -a | grep temperature
hw.acpi.thermal.tz0.temperature: 63.0C
hw.acpi.thermal.tz1.temperature: 64.0C

Is that too hot? dwhite@ figured it out for me after I pasted:

CPU: Intel(R) Core(TM)2 Duo CPU L7500 @ 1.60GHz (1596.01-MHz K8-class CPU)

The CPU specs indicate that 100C is the thermal specification for this CPU.

BTW, they are now at 67C.

What other things do we have here?

# sysctl hw.acpi.thermal
hw.acpi.thermal.min_runtime: 0
hw.acpi.thermal.polling_rate: 10
hw.acpi.thermal.user_override: 0
hw.acpi.thermal.tz0.temperature: 67.0C
hw.acpi.thermal.tz0.active: -1
hw.acpi.thermal.tz0.passive_cooling: 0
hw.acpi.thermal.tz0.thermal_flags: 0
hw.acpi.thermal.tz0._PSV: -1
hw.acpi.thermal.tz0._HOT: -1
hw.acpi.thermal.tz0._CRT: 127.0C
hw.acpi.thermal.tz0._ACx: -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
hw.acpi.thermal.tz1.temperature: 67.0C
hw.acpi.thermal.tz1.active: -1
hw.acpi.thermal.tz1.passive_cooling: 0
hw.acpi.thermal.tz1.thermal_flags: 0
hw.acpi.thermal.tz1._PSV: 95.5C
hw.acpi.thermal.tz1._HOT: -1
hw.acpi.thermal.tz1._CRT: 100.0C
hw.acpi.thermal.tz1._ACx: -1 -1 -1 -1 -1 -1 -1 -1 -1 -1

Oh, all kinds of neat stuff. Most of which I have no knowledge.

Experimentation shows that dev.acpi_ibm.0.fan_level can vary from 0 to 8, although I find level 1 to be fairly quiet. I can only hear the fan when I’m not typing.

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